Charles J Ryan, MD, is The Thomas Perkins Distinguished Professor of Clinical Medicine and Urology at the Helen Diller Family Comprehensive Cancer Center at the University of California, San Francisco. He has published over 100 articles and chapters in the world's leading medical journals.
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Testosterone propels our drive for exploration and risk, for competition and creation, and even our survival. The effects of testosterone permeate the traditions, philosophy, and literature of every known culture—without it, the world would be a dra... SEE MORE